Description: Das Projekt "ACCORD: Atmosphaerenzirkulationsklassifikation und Umrechnung auf regionalen Massstab" wird vom Umweltbundesamt gefördert und von Universität Bern, Geographisches Institut durchgeführt. One of the reasons for the current high interest in climate variability is the likelihood of a growing anthropogenic influence. Its magnitude and timescale are such that its detection demands a characterisation of climate variability over as long a period as possible. Europe is becoming one of the key areas of focus for investigations into climate variability because the North Atlantic is now recognised as being amongst the most important areas for ocean/atmosphere coupling, with climate manifestations - through the North Atlantic Oscillation (NAO) - on the decadal timescale. Major modelling studies are underway or are planned. There are also studies to further explore seasonal predictive capabilities from sea-surface temperatures. Both types of study require a much better characterisation of the variability of climate in the North Atlantic/Europe sector than is currently available. Much effort is expended on GCM (and higher resolution) simulations of present climate and the projection of future climates. Across Europe, impact studies are dependent on climate scenarios generated by 'downscaling' from such models. The assumptions upon which such scenarios are based - that the model control runs adequately simulate present climate and are internally consistent, and that the relationships between large-scale and local climate are stationary over time - are too rarely tested at the regional and sub-regional scales. A prime reason for the inadequate testing of these assumptions is the current absence of robust, automated, methodologies for classifying circulation patterns. ACCORD will address the essential requirements and current shortcomings highlighted above. It will undertake a comprehensive assessment of existing methods of circulation classification, and will develop emerging techniques to produce automated schemes, taking into account space-scales, transportability, powers of discrimination and robustness. The primary information will be surface pressure observations from 1881, but upper air and Reanalysis data will also be used. ACCORD will also examine whether clustering of surface weather variables provides more discriminating power than spatial pattern recognition schemes for pressure. ACCORD will then characterise North Atlantic and European circulation variability over 115 years. This work will range across time- and space-scales, analysing circulation modes, synoptic and sub synoptic features and characteristics, and will include blocking, cut-off lows, Mediterranean and lee cyclones, thunderstorms and precipitation type. One of ACCORD's main aims will be an identification of the importance of the NAO - the most important controlling circulation characteristic for Europe - for seasonal, annual and multiannual distributions of temperature and precipitation. Prime Contractor: University of East Anglia, School of Environmental Sciences; Norwich.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Luftdruck ? Zyklon ? Pelagial ? Klimatologie ? Langzeitwirkung ? Temperaturverteilung ? Umweltcontrolling ? Main ? Globales Klimamodell ? Bildverarbeitung ? Klimavariabilität ? Meereskunde ? Messtechnik ? Regionalplan ? Szenario ? Wetterdaten ? Starkregen ? Geoinformation ? Sturm ? Meeresoberfläche ? Wirkungsmodell ? Kontrollsystem ? Analyseverfahren ? Mesoklima ? Prognosemodell ? Simulation ? Studie ? Automatisierung ? Bestimmungsmethode ? Vergleichsanalyse ? Wirkungsanalyse ? Zirkulationsmodell ? Energie ? Schule ? Meeresgewässer ? Gewerbebetrieb ? Gewitter ? Jahreszeit ? Modellierung ? Kausalzusammenhang ? Umweltwissenschaft ? Globale Veränderung ? Europa ? Nordatlantik ? Klimamodell ? Wetter ? Anthropogener Einfluss ? Atmosphäre ? Physikalische Größe ? Klassifikation ? Niederschlag ? Klimawandel ? Atmosphärische Schichtung ? Klimawirkung ? Klimaszenario ? Standortbedingung ? Kreislaufmodell ? Accord ? Stationäre Betriebsweise ? Atmospheric-Circulation-Classification-and-Regional-Downscaling ? Auflösungsvermögen ? Untersuchungsprogramm ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1997-12-01 - 2000-07-28
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